I have had trouble in the past getting Habotai to take color.
Huh? I wonder why? It would be interesting to investigate. I almost exclusively use habotai and get great results
I also nuke my silks, but don't know if that would make any difference in your case.
It would if they were not nuked long enough, just as not letting them batch above room temp. for a long enough time would effect the outcome.
I see two things in the picture. First, as Steve mentioned, get the nozzle down into folds more and perhaps you are binding too tight. Second, the colors looked kind of washed/pale. If this was not your intent(pastels) then your silk was probably to wet with soda solution thus diluting the dyes or you didn't let your things batch/cure long enough above room temp.
If your things are pretty damp/wet from the soda or vinegar soak either let them sit and dry out some or all the way. If you are impatient like me put them in the washer on the spin cycle. Arrange them along the sidewalls, this helps to prevent any possible deformation of the foldsd and binding you may have done
Kathy